diff --git a/services/surfaceflinger/tests/unittests/Android.bp b/services/surfaceflinger/tests/unittests/Android.bp
index bcabe0d..449b2a6 100644
--- a/services/surfaceflinger/tests/unittests/Android.bp
+++ b/services/surfaceflinger/tests/unittests/Android.bp
@@ -19,6 +19,7 @@
     test_suites: ["device-tests"],
     srcs: [
         ":libsurfaceflinger_sources",
+        "DisplayIdentificationTest.cpp",
         "DisplayTransactionTest.cpp",
         "mock/DisplayHardware/MockComposer.cpp",
         "mock/DisplayHardware/MockDisplaySurface.cpp",
diff --git a/services/surfaceflinger/tests/unittests/DisplayIdentificationTest.cpp b/services/surfaceflinger/tests/unittests/DisplayIdentificationTest.cpp
new file mode 100644
index 0000000..9113171
--- /dev/null
+++ b/services/surfaceflinger/tests/unittests/DisplayIdentificationTest.cpp
@@ -0,0 +1,144 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include "DisplayHardware/DisplayIdentification.h"
+
+namespace android {
+namespace {
+
+const unsigned char kInternalEdid[] =
+        "\x00\xff\xff\xff\xff\xff\xff\x00\x4c\xa3\x42\x31\x00\x00\x00\x00"
+        "\x00\x15\x01\x03\x80\x1a\x10\x78\x0a\xd3\xe5\x95\x5c\x60\x90\x27"
+        "\x19\x50\x54\x00\x00\x00\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
+        "\x01\x01\x01\x01\x01\x01\x9e\x1b\x00\xa0\x50\x20\x12\x30\x10\x30"
+        "\x13\x00\x05\xa3\x10\x00\x00\x19\x00\x00\x00\x0f\x00\x00\x00\x00"
+        "\x00\x00\x00\x00\x00\x23\x87\x02\x64\x00\x00\x00\x00\xfe\x00\x53"
+        "\x41\x4d\x53\x55\x4e\x47\x0a\x20\x20\x20\x20\x20\x00\x00\x00\xfe"
+        "\x00\x31\x32\x31\x41\x54\x31\x31\x2d\x38\x30\x31\x0a\x20\x00\x45";
+
+const unsigned char kExternalEdid[] =
+        "\x00\xff\xff\xff\xff\xff\xff\x00\x22\xf0\x6c\x28\x01\x01\x01\x01"
+        "\x02\x16\x01\x04\xb5\x40\x28\x78\xe2\x8d\x85\xad\x4f\x35\xb1\x25"
+        "\x0e\x50\x54\x00\x00\x00\x01\x01\x01\x01\x01\x01\x01\x01\x01\x01"
+        "\x01\x01\x01\x01\x01\x01\xe2\x68\x00\xa0\xa0\x40\x2e\x60\x30\x20"
+        "\x36\x00\x81\x90\x21\x00\x00\x1a\xbc\x1b\x00\xa0\x50\x20\x17\x30"
+        "\x30\x20\x36\x00\x81\x90\x21\x00\x00\x1a\x00\x00\x00\xfc\x00\x48"
+        "\x50\x20\x5a\x52\x33\x30\x77\x0a\x20\x20\x20\x20\x00\x00\x00\xff"
+        "\x00\x43\x4e\x34\x32\x30\x32\x31\x33\x37\x51\x0a\x20\x20\x00\x71";
+
+// Extended EDID with timing extension.
+const unsigned char kExternalEedid[] =
+        "\x00\xff\xff\xff\xff\xff\xff\x00\x4c\x2d\xfe\x08\x00\x00\x00\x00"
+        "\x29\x15\x01\x03\x80\x10\x09\x78\x0a\xee\x91\xa3\x54\x4c\x99\x26"
+        "\x0f\x50\x54\xbd\xef\x80\x71\x4f\x81\xc0\x81\x00\x81\x80\x95\x00"
+        "\xa9\xc0\xb3\x00\x01\x01\x02\x3a\x80\x18\x71\x38\x2d\x40\x58\x2c"
+        "\x45\x00\xa0\x5a\x00\x00\x00\x1e\x66\x21\x56\xaa\x51\x00\x1e\x30"
+        "\x46\x8f\x33\x00\xa0\x5a\x00\x00\x00\x1e\x00\x00\x00\xfd\x00\x18"
+        "\x4b\x0f\x51\x17\x00\x0a\x20\x20\x20\x20\x20\x20\x00\x00\x00\xfc"
+        "\x00\x53\x41\x4d\x53\x55\x4e\x47\x0a\x20\x20\x20\x20\x20\x01\x1d"
+        "\x02\x03\x1f\xf1\x47\x90\x04\x05\x03\x20\x22\x07\x23\x09\x07\x07"
+        "\x83\x01\x00\x00\xe2\x00\x0f\x67\x03\x0c\x00\x20\x00\xb8\x2d\x01"
+        "\x1d\x80\x18\x71\x1c\x16\x20\x58\x2c\x25\x00\xa0\x5a\x00\x00\x00"
+        "\x9e\x01\x1d\x00\x72\x51\xd0\x1e\x20\x6e\x28\x55\x00\xa0\x5a\x00"
+        "\x00\x00\x1e\x8c\x0a\xd0\x8a\x20\xe0\x2d\x10\x10\x3e\x96\x00\xa0"
+        "\x5a\x00\x00\x00\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
+        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
+        "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xc6";
+
+template <size_t N>
+DisplayIdentificationData asDisplayIdentificationData(const unsigned char (&bytes)[N]) {
+    return DisplayIdentificationData(bytes, bytes + N - 1);
+}
+
+} // namespace
+
+TEST(DisplayIdentificationTest, isEdid) {
+    EXPECT_FALSE(isEdid({}));
+
+    EXPECT_TRUE(isEdid(asDisplayIdentificationData(kInternalEdid)));
+    EXPECT_TRUE(isEdid(asDisplayIdentificationData(kExternalEdid)));
+    EXPECT_TRUE(isEdid(asDisplayIdentificationData(kExternalEedid)));
+}
+
+TEST(DisplayIdentificationTest, parseEdid) {
+    auto edid = parseEdid(asDisplayIdentificationData(kInternalEdid));
+    ASSERT_TRUE(edid);
+    EXPECT_EQ(0x4ca3u, edid->manufacturerId);
+    EXPECT_STREQ("SEC", edid->pnpId.data());
+    // ASCII text should be used as fallback if display name and serial number are missing.
+    EXPECT_EQ("121AT11-801", edid->displayName);
+
+    edid = parseEdid(asDisplayIdentificationData(kExternalEdid));
+    ASSERT_TRUE(edid);
+    EXPECT_EQ(0x22f0u, edid->manufacturerId);
+    EXPECT_STREQ("HWP", edid->pnpId.data());
+    EXPECT_EQ("HP ZR30w", edid->displayName);
+
+    edid = parseEdid(asDisplayIdentificationData(kExternalEedid));
+    ASSERT_TRUE(edid);
+    EXPECT_EQ(0x4c2du, edid->manufacturerId);
+    EXPECT_STREQ("SAM", edid->pnpId.data());
+    EXPECT_EQ("SAMSUNG", edid->displayName);
+}
+
+TEST(DisplayIdentificationTest, parseInvalidEdid) {
+    EXPECT_FALSE(isEdid({}));
+    EXPECT_FALSE(parseEdid({}));
+
+    // Display name must be printable.
+    auto data = asDisplayIdentificationData(kExternalEdid);
+    data[97] = '\x1b';
+    auto edid = parseEdid(data);
+    ASSERT_TRUE(edid);
+    // Serial number should be used as fallback if display name is invalid.
+    EXPECT_EQ("CN4202137Q", edid->displayName);
+
+    // Parsing should succeed even if EDID is truncated.
+    data.pop_back();
+    edid = parseEdid(data);
+    ASSERT_TRUE(edid);
+    EXPECT_EQ("CN4202137Q", edid->displayName);
+}
+
+TEST(DisplayIdentificationTest, getPnpId) {
+    EXPECT_FALSE(getPnpId(0));
+    EXPECT_FALSE(getPnpId(static_cast<uint16_t>(-1)));
+
+    EXPECT_STREQ("SEC", getPnpId(0x4ca3u).value_or(PnpId{}).data());
+    EXPECT_STREQ("HWP", getPnpId(0x22f0u).value_or(PnpId{}).data());
+    EXPECT_STREQ("SAM", getPnpId(0x4c2du).value_or(PnpId{}).data());
+}
+
+TEST(DisplayIdentificationTest, generateDisplayId) {
+    const auto primaryId = generateDisplayId(0, asDisplayIdentificationData(kInternalEdid));
+    ASSERT_TRUE(primaryId);
+
+    const auto secondaryId = generateDisplayId(1, asDisplayIdentificationData(kExternalEdid));
+    ASSERT_TRUE(secondaryId);
+
+    const auto tertiaryId = generateDisplayId(2, asDisplayIdentificationData(kExternalEedid));
+    ASSERT_TRUE(tertiaryId);
+
+    // Display IDs should be unique.
+    EXPECT_NE(primaryId, secondaryId);
+    EXPECT_NE(primaryId, tertiaryId);
+    EXPECT_NE(secondaryId, tertiaryId);
+}
+
+} // namespace android
diff --git a/services/surfaceflinger/tests/unittests/DisplayTransactionTest.cpp b/services/surfaceflinger/tests/unittests/DisplayTransactionTest.cpp
index 3a9cfd2..d9765e0 100644
--- a/services/surfaceflinger/tests/unittests/DisplayTransactionTest.cpp
+++ b/services/surfaceflinger/tests/unittests/DisplayTransactionTest.cpp
@@ -354,6 +354,8 @@
                     getDisplayAttribute(HWC_DISPLAY_ID, HWC_ACTIVE_CONFIG_ID,
                                         IComposerClient::Attribute::DPI_Y, _))
                 .WillOnce(DoAll(SetArgPointee<3>(DEFAULT_DPI), Return(Error::NONE)));
+        EXPECT_CALL(*test->mComposer, getDisplayIdentificationData(HWC_DISPLAY_ID, _, _))
+                .WillRepeatedly(Return(Error::UNSUPPORTED));
     }
 
     // Called by tests to set up HWC call expectations
diff --git a/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockComposer.h b/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockComposer.h
index 267670a..2a707a4 100644
--- a/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockComposer.h
+++ b/services/surfaceflinger/tests/unittests/mock/DisplayHardware/MockComposer.h
@@ -77,6 +77,7 @@
     MOCK_METHOD2(getPerFrameMetadataKeys,
                  Error(Display, std::vector<IComposerClient::PerFrameMetadataKey>*));
     MOCK_METHOD2(getDataspaceSaturationMatrix, Error(Dataspace, mat4*));
+    MOCK_METHOD3(getDisplayIdentificationData, Error(Display, uint8_t*, std::vector<uint8_t>*));
     MOCK_METHOD3(getReleaseFences, Error(Display, std::vector<Layer>*, std::vector<int>*));
     MOCK_METHOD2(presentDisplay, Error(Display, int*));
     MOCK_METHOD2(setActiveConfig, Error(Display, Config));